What are the reasons for the engine warning light in the Buick Regal?

[Bill]

Buick Regal engine warning light may illuminate due to the following reasons: Substandard exhaust emissions: Issues such as poor fuel quality, failed catalytic converter, excessive carbon buildup in the intake manifold, clogged fuel injectors, faulty oxygen sensors, or occasional engine misfires can trigger the engine warning light. Among these, poor fuel quality is the most common cause. Poor engine system performance: The warning light may also illuminate due to malfunctions in components like the throttle pedal sensor, throttle position sensor, mass airflow sensor, crankshaft position sensor, or poor electrical connections. Transmission system issues in some vehicles: Certain transmission system problems, such as internal faults, slippage, or overheating, may also be indicated by the engine warning light.